CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Stockholders' Equity [Abstract]
Dividends paid to public stockholders (per share)	$ 0.86	$ 0.81	$ 0.77
Dividends paid to affiliate (per share)	$ 0.86	$ 0.81	$ 0.77